import hashlib
import random

from django.http import HttpResponse
from django.shortcuts import render, redirect

# Create your views here.

# 后台管理首页
from django.urls import reverse

from pet_admin.models import Users


def index(request):
    return render(request, 'pet_admin/index/index.html')


# 后台登陆页
def login(request):
    return render(request, 'pet_admin/index/login.html')


# 执行登陆
def dologin(request):
    try:
        # 对比验证码
        if request.POST['code'] != request.session['verifycode']:
            context = {"info": "验证码错误"}
            return render(request, 'pet_admin/index/login.html', context)

        # 根据登陆账号查询登陆者信息
        user = Users.objects.get(user_account=request.POST["user_account"])
        # 判断当前账号是是否是店主
        if user.user_type == 0:
            # 判断登陆密码的正确
            # 密码md5处理
            md5Pw = hashlib.md5()
            s = request.POST["user_password"] + user.user_password_salt  # 从表单中获取密码且加干扰值
            md5Pw.update(s.encode('utf-8'))
            if user.user_password_hash == md5Pw.hexdigest():  # 比较数据库密码和用户输入的密码
                print("登陆成功")
                # 把当前用户信息以adminUser写入session中
                request.session['adminUser'] = user.toDict()
                # 重定向到后台首页
                return redirect(reverse('admin_index'))
            else:
                context = {"info": "登陆密码错误"}
        else:
            context = {"info": "账号权限不足"}
    except Exception as err:
        print(err)
        context = {"info": "该用户不存在"}
    return render(request, 'pet_admin/index/login.html', context)


# 执行退出
def logout(request):
    del request.session['adminUser']
    return redirect(reverse('admin_index'))


# 输出验证码
def verify(request):
    # 引入随机函数模块
    import random
    from PIL import Image, ImageDraw, ImageFont
    # 定义变量，用于画面的背景色、宽、高
    # bgcolor = (random.randrange(20, 100), random.randrange(
    #    20, 100),100)
    bgcolor = (242, 164, 247)
    width = 100
    height = 25
    # 创建画面对象
    im = Image.new('RGB', (width, height), bgcolor)
    # 创建画笔对象
    draw = ImageDraw.Draw(im)
    # 调用画笔的point()函数绘制噪点
    for i in range(0, 100):
        xy = (random.randrange(0, width), random.randrange(0, height))
        fill = (random.randrange(0, 255), 255, random.randrange(0, 255))
        draw.point(xy, fill=fill)
    # 定义验证码的备选值
    # str1 = 'ABCD123EFGHIJK456LMNOPQRS789TUVWXYZ0'
    str1 = '0123456789'
    # 随机选取4个值作为验证码
    rand_str = ''
    for i in range(0, 4):
        rand_str += str1[random.randrange(0, len(str1))]
    # 构造字体对象，ubuntu的字体路径为“/usr/share/fonts/truetype/freefont”
    font = ImageFont.truetype('static/arial.ttf', 21)
    # font = ImageFont.load_default().font
    # 构造字体颜色
    fontcolor = (random.randrange(0, 255), random.randrange(0, 255), random.randrange(0, 255))
    # 绘制4个字
    draw.text((5, -3), rand_str[0], font=font, fill=fontcolor)
    draw.text((25, -3), rand_str[1], font=font, fill=fontcolor)
    draw.text((50, -3), rand_str[2], font=font, fill=fontcolor)
    draw.text((75, -3), rand_str[3], font=font, fill=fontcolor)
    # 释放画笔
    del draw
    # 存入session，用于做进一步验证
    request.session['verifycode'] = rand_str
    """
    python2的为
    # 内存文件操作
    import cStringIO
    buf = cStringIO.StringIO()
    """
    # 内存文件操作-->此方法为python3的
    import io
    buf = io.BytesIO()
    # 将图片保存在内存中，文件类型为png
    im.save(buf, 'png')
    # 将内存中的图片数据返回给客户端，MIME类型为图片png
    return HttpResponse(buf.getvalue(), 'image/png')
